tests: zmq: support both SNDHWM and old HWM (libzmq <3.0); Thanks to Geoff Salmon
tests: zmq: support both SNDHWM and old HWM (libzmq <3.0); Thanks to Geoff Salmon

collinstocks/eventlet,tempbottle/eventlet,lindenlab/eventlet,tempbottle/eventlet,lindenlab/eventlet,lindenlab/eventlet,collinstocks/eventlet